STATIC mp_obj_t stm_mem_subscr(mp_obj_t self_in, mp_obj_t index, mp_obj_t value) {
// TODO support slice index to read/write multiple values at once
stm_mem_obj_t *self = self_in;
if (value == MP_OBJ_NULL) {
// delete
return MP_OBJ_NULL; // op not supported
} else if (value == MP_OBJ_SENTINEL) {
// load
uint32_t addr = get_read_addr(index, self->elem_size);
uint32_t val;
switch (self->elem_size) {
case 1: val = (*(uint8_t*)addr); break;
case 2: val = (*(uint16_t*)addr); break;
default: val = (*(uint32_t*)addr); break;
}
return mp_obj_new_int(val);
} else {
// store
uint32_t addr = get_write_addr(index, self->elem_size);
uint32_t val = mp_obj_get_int(value);
switch (self->elem_size) {
case 1: (*(uint8_t*)addr) = val; break;
case 2: (*(uint16_t*)addr) = val; break;
default: (*(uint32_t*)addr) = val; break;
}
return mp_const_none;
}
}
int
main(int argc, char *argv[])
{
int dfd = -1;
int ret = 0, read_bit;
long read_addr = 0, slope, normalized = 0;
long base_avg_slope, base_std_dev, curr, prev= -1;
long mean_age = 0;
if(argc < 2)
{
printf("Usage : listener <drive-for-communication>\n");
return -1;
}
dfd = open(argv[1], O_RDWR);
if(dfd == -1)
{
perror("open");
return -1;
}
/* This is the read address that is used for entire session */
read_addr = get_read_addr(dfd);
debug("Read addr : %ld\n", read_addr);
printf("Creating baseline parameters for read bit detection ...\n");
printf("Please wait ...\n");
get_baseline_results(dfd, read_addr, &base_std_dev, &base_avg_slope);
printf("----------------- BASELINE PARAMETERS ------------------\n");
printf("std_dev : %ld\n", base_std_dev);
printf("avg_slope : %ld\n", base_avg_slope);
//synchronize();
mean_age = time(NULL);
while(1)
{
#if 0
if( time(NULL) > (mean_age + MAXIMUM_MEAN_AGE) )
{
//read_addr = get_read_addr(dfd);
//debug("Read addr : %ld\n", read_addr);
printf("Re-establishing baseline parameters for read bit detection ...\n");
printf("Please wait ...\n");
get_baseline_results(dfd, read_addr, &base_std_dev, &base_avg_slope);
printf("----------------- BASELINE PARAMETERS ------------------\n");
printf("std_dev : %ld\n", base_std_dev);
printf("avg_slope : %ld\n", base_avg_slope);
mean_age = time(NULL);
}
#endif
curr = get_mean_access_time(dfd, read_addr);
if(prev == -1)
{
prev = curr;
debug("Exiting from here ...", "");
continue;
}
slope = curr - prev;
normalized = normalized + slope;
if(normalized > base_avg_slope)
read_bit = 1;
else
read_bit = 0;
prev = curr;
//printf("curr = %12ld slope = %12ld normalized = %12ld Bit detected --------> (%d)\n",
// curr, slope, normalized, read_bit);
printf("curr = %12ld slope = %12ld normalized = %12ld \n",
curr, slope, normalized);
}
return 0;
}
